Award-winning science author Seymour Simon and the Smithsonian Institution follow the path of air through your respiratory system in this breathtaking new book. Without your lungs and your entire respiratory system, the rest of your body wouldn’t receive the oxygen it needs to survive. You breathe more than 20,000 times each and every day. This is the first brand-new title in the Smithsonian/Collins line of Seymour Simon science books.